Grit Size: 30 Grit; 50 Grit; 100 Grit; 150 Grit; 200 Grit; 400 Grit; 800 Grit; 1500 Grit; 3000 Grit; 6000 Grit. Sharp and Wear-resistant, Preventing Board Scorching or Staining, with Rapid Heat Dissipation and Low Noise Levels to Extend Service Life.